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Morley formed new grade beam foundations between the existing spread footing foundations originally placed circa 1927. Existing building perimeter foundations were replaced with new continuous footings and pedestals were cast to support the new friction-pendulum isolator system. A post-tensioned beam grid was placed atop the isolators to encase existing columns in confined subterranean levels. After placing and curing, beams were tensioned and columns were removed from the plane of isolation, which transferred the building load to the new foundation. Voids between beams were then filled with concrete on metal decking, restoring the basement level floor. Four concrete stairwells located in each corner of the interior courtyard were also isolated.
City of Pasadena Department of Public Works
Architectural Resources Group
Cornerstone of Excellence, Southern California Ready Mix Concrete Association Project of the Year, Concrete Reinforcing Steel Institute